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NOVA | Promotion | The Elegant Universe: Part 3 Preview

Brian Greene shows how Edward Witten of Princeton's Institute for Advanced Study, aided by others, revolutionized string theory by successfully uniting the five different versions into a single theory that is cryptically named "M-theory," a development that requires a total of eleven dimensions.

S30 E14 | 0:00:30 | AIRED: 11/23/2011 |
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